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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360bc26f90adb9f40952a30d9f462f9d842c92782e2d3172a8dc97af1bd97198' 
  AND token = '51VmcdLSBIeRKxBV+eDqHGcQS0E1gTCJ68NqC7YJq/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}